Fiber Lax Side Effects

Generic Name: polycarbophil

Note: This page contains information about the side effects of polycarbophil. Some of the dosage forms included on this document may not apply to the brand name Fiber Lax.

Not all side effects for Fiber Lax may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

Applies to polycarbophil: oral tablet, oral tablet chewable

Get emergency medical help if you have any of these signs of an allergic reaction while taking polycarbophil (the active ingredient contained in Fiber Lax) hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using polycarbophil and call your doctor at once if you have a serious side effect such as:

  • vomiting;

  • choking on the tablet;

  • trouble swallowing;

  • chest pain; or

  • rectal bleeding.

Less serious side effects of polycarbophil may include:

  • mild stomach pain;

  • bloating; or

  • gas.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.

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